Transformer



oct. 19,1926. '1,603,832

E. A. BOHLMAN ET Al.

TRANSFORMER Hll.

www

Aso

Patented Oct. 19, 1926.

UNITED STATES PATENT OFFICE.

ERNEST A. BOHLMAN AND MICHAEL B. STAZAK, OF CHICAGO, ILLINOIS, ASSIGNORS T KELLOGG SWITCHBOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A COR,-

PORATION OF ILLINOIS.

TRANSFORMER.

Application led May 23,

Qur invention relates to transformers and has to do more particularly with the construction and assemblage of the various parts in a simple, economical and efficient manner whereby a transformer is provided which is cheap to manufacture and efficient in its operation.

A feature of our invention is the provision of an enclosing case for enclosing certain parts of our transformer, which case comprises two parts, and which parts are so constructed and formed as to permit their being secured together to enclose the different parts of our transformer, and to provide means for mountingour transformer in position on any suitable mounting or supporting means.

Another feature of our invention is the provision of a combined terminal rack and cover cap to which is secured terminals. for connecting external conductors to the windings of our transformer, and which cover cap is provided with a depressed body portion of a size and shape to receive suitably shaped ends of the parts of the enclosing case of our invention to'secure said ends together against displacement. y

Still another feature yof our invention is the provision-of means integrally formed cap for engaging the laminations of the core of our transformer to prevent displacementV the manner in' which We secure the termi# f ,nals to the combined terminal rack and cover f l 'cap against rotation: and'to retain certainy laminat-edf core land''windings"'l?,an'd S,

i parts of' the terminals in aj certain' definite f position to -permit Athe-solde'ririg jof 'the'l con#y '-'ductors leadingfromflthe windingsl'offourf t-ransfoi'mer to said certairiA parts.

",rtilkz a: furtherfeature.ofourinventionl with the combined terminal rack and cover 1923. Serial No. 640,831.

others will be more specifically pointed out in the ensuing specification. For a clear understanding of our invention relerence may be had to the accompanying drawing, in which, like reference characters in the several views denote like parts, and in which;

Fig. l is. a plan View of our invention;

Fig. 2 is a top plan view of Fig. 1;

Fig. 3 is a side view of Fig. l;

Fig. l is a bottom plan View of Fig. l;

Fig. 5 is a sectional view of our invention along the line 5 5 of Fig. 2;

Fig. 6 is a sectional view of our invention along` the line 6-6 of Fig. 2;

Fig. 7 is a View along the line 7-7 of F ig. l;

Fig. 8 is a bottom plan View of the com- 70 bined terminal rack and cover cap of our invention showing its construction.

Fig. 9 is a plan view of one the halves or parts of the enclosing case of our invention. Y

f Referring now 'in detail to our invention, R is the core of our transformer, and is comyposed of a plurality of laminations of suitable material, and which laminations are suitably shaped and formed to receive the usual layers of the primary winding P and layers of the secondary'windingl S, each layer being suitably insulated from the other layers by a suitable layer of insulation, such as paraflined or waxed paper, or the like,

-as is well known in the art. .The primary winding P isA insulated Afrom the "core RA :by an insulation sleeve l, and the'secondary windings vis insulated fromithe Aprimary winding P by an msul'atlonmember 1.f

yTheenclosing case C, fo'rrenclosing 'the ecomp*rises, .two *halvesvv or parts 2 "and '3 and 'as vv'each fha-lf or `part is. constructed @the "l's'anue",y ldentical. manlief, *a* description of fone 95 "will suflice forfag` clear: understanidmg'pf' the 50 Iout :interfering with i the laminati'ons l of" the a otlie1ha`lf `or part. f yFo' rthe 'sake fof `descrip;i 'Y tion '2v7 will sb'e described," lfAj'Tli'e l alf' or" `windings' of our 'transformerl to"b'e"conlf-pa'r t` @tis-stamped outofasuitablepiece; of .'z-nec'tedxvithxthe*terminals fsec'uredt`o theimaterialg-and isfprovidedwithtaffpocket 4, 100 f.' .combined terminal -rackandcovencapwithl, "for- 4'rje'ceiving iagportiIi-l of' vthe'y of n'iindigsl? and S'f'andlayers o'ffinsulat-ionI asH will" be more clearly pointedVl out in "'the' ensuing specification. A pair of flanges 5 M45 wis the provision?ofadepression int each half The above mentioned features as wel] as integrally formed with the half 2 is provided, and the ends 6 and 7 of said halt1 2 are turned over at right angles with the main body portion of said half 2, and parallel to each other. The end 6 is adapted to support the combined terminal rack and cover cap 8. The end 7 is adapted to secure our transformer to any suitable mounting or supporting member. A wingmemberlO is provided which is integrally formed with the half or part 2, and a slot llis also provided, the purpose of said wing 10, and slot 11 will be pointed out later.

The combined terminal rack and cover cap 8 of our invention, is formed out of some suitable non-conducting material. such as bakelite, or the like, and has a depression l2 formed therein, the walls of said depression being ,of the same contour as the end 6 of the half or part 2 of-the case C, and is adapted to receive the ends 6 and 6 of halves 2 and 3 of the casingr C as will later be pointed out more in detail. Members 13, 14 and 15 which are integrally formed with the cover cap 8, are provided and are adapted to engage the laminations ot the core of our transformer to assist in retaining the said laminations in position against displacement and also to separate the cover cap 8 from said laminations to permit the conductors leading from the windings P and S of our transformer, to be led through suitable openings 16, in the cover cap 8, to the terminals T secured to the said cover cap 8.

To the cover cap 8 is secured a number of terminals T which serve to connect external conductors with the windings P and S of our transformer, and since each one of said terminals is the same and secure-d to the cover cap 8 in the same manner, a description of one will be sufficient to give a clear understanding of the others of said terminals. A screw threaded member 20, having a hexagonally shaped head 21 is provided and has its threaded end extending through a suitable opening 22 in the cover cap 8, while its hexagonal head engages a hexagonally shaped depression 23 in the cover cap 8. By having the hexagonal head 21 of member 20 engaging the hexagonal depression 23 of cover ca 8, it is obvious that the said member 2() will be prevented from rotating with. 1n the opening 22 of the cover cap 8. A collar or raised portion 24, formed integrally with the cover cap 8, is provided and has a groove 25 cut therein. A member 26 is provided and has an opening in its one end, to permit it to be slipped over the threaded end of the member20, the said one end of said member 26 resting on the cover cap 8 within the collar or raised portion 24, the other or free end 27 of said member 26 will be positioned overthe opening 16 in the cover cap 8, so that the conductor leading from the transformer winding P or S may be led through said opening 16 and soldered to the said end 27 of member 26, and to prevent displacement of member 26 relative to the opening 16, an intermediate portion of the body of said member 26 will engage and rest in the groove 25 provided in the collar or raised portion 24. A spring washer 28 is slipped over the end of member 20 and brought into engagement with the member 26, and a hexagonal nut 29 is screwed down on the threaded end of member 20 and against spring washer 28, the spring washer 28 serving for the well known purposes. A member 30 is now slipped over the threaded end of member 20 and brought into engagement with the nut 29, said member 30 being adapted to have an external conductor soldered to its free end; and to secure the member 30 on the member 20, a nut 31 is provided which has screwthreaded engagement with the member 20, and when screwed down into engagement with said member 30, it will hold the member 30 in place. Y

Having described the ditferent parts of our invention, a description of the manner in which the halves or parts'2 and 3 are secured together to enclose the core R and windings of our transformer, and the manner in which the-cover cap 8 is secured in position on the vcase C will now be given.

The wing 10 of the half 2, has itsend 10 turned back at right angles to the main body portion of said wing 10 and is adapted to pass through the opening 11 in the half or part 3 of the case C and to engage the portion 11 below the said opening 11, and the wing 10 of the half 3 has its end turned back at right angles to the main body portion of said wing of said half 3, and is adapted to pass through the opening 11 in the half 2 of the case C, and to engage the. portion 11 below opening 11 in said half 2. The openings 11 and wing 10 of the halves or parts 2 and 3 of the case C yare so positioned that one of the flanges 5 ofthe half 2 will engage the inner lace of one of the ianges 5 of the half 3, while the other flange 5 of the halt` 2 will engage the outer face of the other {iange 5 of the ,half 3 of said case C. When the wings 10 of halves 2 and 3 are engaging the openings 11 in said halves, the ends 6 and 6 may be separated sufficiently liar enough to permit` the insertion of the laminated core R and the layers of the'windings P and S and layers of insulation .carried bv said laminated coro R, so that portions of said layers of the windings and layers of insulation will engage the pockets 4, provided in the halves 2 and 3 of the case C, the wings 10 and openings 11, serving to give a hinge effect when the ends 6 and 6 are separated to per mit the insertion of the core R and lax ers of windings and layers of insulation. When the laminated core R, and layers of windings and "layers of insulation are inserted, and

flanges 5 together their entire length, as

pointed out above, whereby the inner faces 36 and 36 of 'halves 2 and 3 respectively of the case C, will engage the laminated core R, while the fiange 5 of, said halves 2 and 3 will be in close proximity to the ends 37 and 37 of said laminated core R. The cover cap 8 is now placed over the ends 6 and 6 of halves 2 and 3, so that said ends 6 and 6 will engage the walls 12 and 122 respectively of the depression 12 in said cover cap 8, and the members 13, 14 and 15 will be brought into engagement with the end 39 ofthe laminatedfcore R, and to secure the cover cap 8 in position upon the said ends 6 and 6, screws 40 and 40 are provided which eX- tend through suitable openings 41 and 41 in the cover cap 8 and openings 42 and 42 in the case C, and then have screw-threaded engagement with suitable nuts 43 and 43. An elongated depressed'portion 44 is provided in the ends 6 and 6 of the halves 2 and 3 of the case C for receiving the conductors, connected to the windings of our transformer, to permit the said conductors to be led to the openings 16 in the cover cap 8, whereupon said conductors extend through the said openings 16 and are soldered to the proper members 26 of terminals T. The turned back ends 10 of the wings 10 of the halves 2 and 3 engaging the body portion 11 below the openings 11 in said halves 2 and 3, will secure the said halves together at one end, and the cover cap 8 and screws 40 and 40 and nuts 43 and 43 will secure the other ends of said halves together to form the cover case C of our transformer, and the laminated core R will engage and be clamped between the members 13, 14 and 15 of the cover cap 8 and the wings 10 of the halves 2 andii, to prevent longitudinal movement of said laminated core R in one direction, and the flanges 5 of said halves 2 and 3 will prevent longitudinal movement of said core R in the other direction, while the portions of the layers of the windings and layers of insulation will engage 'the pockets 4 formed in the said halves 2 and 3 of the case C. To secure our transformer upon a suitable mounting or supporti" ing member, openings 45 are provided in the ends 7 of the halves 2 and 3 and which openings are adapted to receive suitable screws. 7

While we haveshown and described a preferred embodiment of our' invention, it is to be understood that we'do not wish to be limited to the exact 'structure as shown land described vbut intend-to cover all changes and modifications, `that may come within the scope and spirit of the appended claims.

Having described our invention what we claim as new and desire to secure by United States Letters Patentfis 1. Ina device of the characterdescribed, a core, windings for said core, an enclosing case comprising two parts for receiving and enclosing said core and windings, means integrally formed with said parts for securingsaid parts together at one end, and a cover cap provided with a depressionfor receiving the opposite end of said parts to secure the same together, and means for engaging sai cover cap and the said parts of said case for preventing displacement of said cover cap and said parts of said case.

2. In a transformer of the'character described, an enclosing case comprising two parts for receiving and enclosing said transformer, means integrally formed with said parts for securing said parts together at one end, a top cover for said case having a body depression for receiving one end of each of said parts for securing said parts together, and means for preventing the displacement of said top cover from said case.

3. In a transformer of the character described, an enclosing case comprising two parts for receiving and enclosing said transformer, flanges integrallyY formed with said parts, the flanges of one of said parts adapted to engage the flanges of the other of said parts, means integrally formed with said parts for securing said parts together at one end, and a top cover adapted to fit over the` opposite ends of said parts to secure said opposite ends together, said top cover and said means adapted to prevent longitudinal movement of said transformer in one direction while said flanges prevent longitudinal movement of said transformer in the other direction and means for securing said top cover on said enclosing case.

4. A transformer of the class described including a laminated core, windings for said laminated c ore, an enclosing case comprising two parts for enclosing said core and windings, poc'kets formed in the said parts of said case, for receiving portions of said windings, means integrally formed with said parts for securing said parts together at one end .and for supporting said laminated core, a cover cap provided with a body depression for receiving ends of said parts to secure'the same together, whereby said laminated core and windings are secured between said parts, and means integrally formed with said cover cap for engaging said laminated core, said first and last means adapted to prevent- 1ongitudinal movement of said laminated 5. A transformer of the class `described including a laminated-,core and windings for the same, an enclosing casecomprising two parts for receiving and enclosing said core and windings, means integrally formed with with a depression for fitting over the other "ends of said parts, the said other ends of said parts engaging the walls of said depression whereby said parts are secured together and said laminated core and said windings are secured between the parts of said case, and means integrally formed with said cover cap for separating said cover cap from said laminated core and adapted to oo-operate with said first means to prevent longitudinal movement of said laminated core within said enclosing case.

6. A transformer of the class described, including a laminated core and windings for said laminated core, an enclosing case comprising two parts for receiving and enclosing said core and windings, a cover cap for said case adapted to receive one end of said case and to be secured thereon, terminals secured to said cover cap, means for said terminals for connecting external conductors with the windings of said laminated core, means 4formed integrally with said case and means formed integrally with said cover cap, said means adapted to cooperate to permit the leads of the windings of said laminated core to be conducted and connected to said terminals without interfering with any part of said transformer.

7 A transformer of the class described including a laminated core provided with windings, a case for receiving and enclosing said core and windings, a cover cap, provided with a depression and adapted to engage said case, a terminal secured to said cover'cap, a member for said terminal for receiving an external conductor, another member for said terminal for receiving a conductor extending from one of the windings of said laminated core, said last conductor extending through an opening in said cover cap, and means integrally formed with said cover cap for retaining said second member in a certain position relative to the opening in said cover cap.

8. A transformer of the class described including a laminated core, windings for said core, a. case for receiving and enclosing said core and windings, a -cover cap provided with a depression and adapted to engage said case, a terminal secured to said cover cap,

said terminal having a hexagonally shaped head for engaging a hexagonally shaped depression in said cover cap to prevent rotation of said terminal, a member for said terminal, for connecting one of the windings of the transformer to said terminal via an opening in said cover cap, and a depression in said cover cap adapted to be engaged by said member for retaining said member in a certain position relative to said opening in said cover cap.

9. A transformer of the class described including a core and windings for said core, a case for supporting and enclosing said core and windings, a top cover provided with a depression and adapted to engage said case, a terminal secured to said top cover, said terminal having a hexagonally shaped head for engaging a hexagonally shaped depression in said top cover to prevent rotation of said terminaLf-a member for said terminal, means integrally formed with said top cover for receiving said member 'and to retain the same in a stationary position relative to the opening in said top coyer, .means integrally formed in said case and means integrally formed with said top coverfor permitting one of the windings of said core to be connected to said member via said opening in said top cover without interfering with any part of the transformer.

l0. A transformer of the class described,

including a laminated core and windings for said laminated core, a case for supporting and receiving said laminated cdre and windings, atop cover provided with orifices and adapted to engage said case, said top cover also provided with openings having a portion of their walls angularly shaped, terminals engaging said openings and angularly shaped walls and secured therein against rotation, members secured on said terminals y and in operative position relative to said orifices in said cover cap, means for connecting the windings of said core with said members via said orifices, and means integrally formed with said case for supportingsaid transformer on a mounting plate or base.

11. A transformer of the character described including a casing comprising a lurality of parts each having an exten ing wing portion and an orifice, the wing portion of one part adapted to engage the orifices of another part to form interlocking means, a cover for said casing, and means for securing said cover to said casing; A 12. A transformer of' the character de scribed including a two-part casing having integrally formed interlocking members comprising extending portions adapted to engage an oriice in the other of said parts, and a terminal plate provided with means for securing the same to said casing to form a unit.

13. A transformer ofthe character described including a two-part casing having interlocking integrally formed members so arranged as to form a groove, a core extending into said groove in said casing, a terminal plate for said casing, means for attaching said termina-l plate to said casing, and

integrally' formed means for said terminal plate resting a ainst said core.

14;. A trans ormer of the character delos las

scribed including a casing formed of two formed portions resting against said transmembers, integrally formed interlocking former core to hold the same in its proper 10 means for said members comprising an exposition. s

tending portion on each member adapted to Signed by us at Chicago, in the county of engage an orifice in the other member, a Cook and State of Illinois, this 21st day lof transformer core resting against said in- May,1923.

tegially formed locking means, and a cover ERNEST A. BOHLMAN. plate for said casing having integrally A MICHAEL B. STAZAK. 

